نتایج جستجو برای: leaf spotting pathogen

تعداد نتایج: 153226  

Journal: :Canadian Journal of Plant Science 2022

Aspen and poplar trees are important horticultural plants grown in Canada for aesthetic, commercial woodlot windbreak applications. Bronze leaf is a destructive disease Populus spp. caused by the fungal pathogen Apioplagiostoma populi Barr. This often difficult to isolate confirm from infected plant tissues has been mainly identified symptoms morphological characteristics of A. when fruiting bo...

2010
Helen Fones Calum A. R. Davis Arantza Rico Fang Fang J. Andrew C. Smith Gail M. Preston

Metal hyperaccumulation, in which plants store exceptional concentrations of metals in their shoots, is an unusual trait whose evolutionary and ecological significance has prompted extensive debate. Hyperaccumulator plants are usually found on metalliferous soils, and it has been proposed that hyperaccumulation provides a defense against herbivores and pathogens, an idea termed the 'elemental d...

2008
Christa P.H. Mulder Bitty A. Roy Sabine Güsewell

Parasite damage strongly affects dynamics of boreal forests. Damage levels may be affected by climate change, either directly or indirectly through changes in properties of host trees. We examined how herbivore and pathogen damage in Alnus viridis subsp. fruticosa (Rupr.) Nym. depend on leaf morphology and chemistry, tree size, and tree neighborhood. Damage and tree properties were measured in ...

Journal: :Plant biology 2009
G Jürges H-H Kassemeyer M Dürrenberger M Düggelin P Nick

In order to obtain insight into host responses to grapevine downy mildew (Plasmopara viticola), we compared pathogen development on a panel of Vitis species from North America, Asia and Europe. Leaf discs from different host species were inoculated in parallel, and the colonisation of the mesophyll was visualised by aniline blue staining and quantified with respect to infection incidence and my...

Journal: :Molecular ecology 2010
Guillermo Pérez Bernard Slippers Brenda D Wingfield Gavin C Hunter Michael J Wingfield

Sexual reproduction in fungi involves either a single individual (selfing) or two individuals (outcrossing). To investigate the roles that these two strategies play in the establishment of an invasive alien pathogen, the Eucalyptus leaf-infecting fungus, Teratosphaeria (Mycosphaerella) nubilosa was studied. Specifically, the genetic diversity of the pathogen was investigated at micro and macros...

1998
Wai Yat Wong John Robertson

This paper describes the use of phonological knowledge to enhance current audio word spotting technology based on Hidden Markov Model. It reports on the result of an word-spotting experiment done on an audio data recorded from a live conference. The result of the experiment demonstrates the positive contribution of phonological knowledge towards audio word-spotting.

2015
Kyung-Sook Han Jong-Han Park Chang-Gi Back Mi-Jeong Park

In 2006~2010, leaf spot symptoms, that is, small, yellow spots that turned into dark brown-to-black lesions surrounded by a yellow halo, were observed on Cymbidium spp. in Gongju, Taean, and Gapyeong in Korea. A Fusarium species was continuously isolated from symptomatic leaves; in pathogenicity testing, isolates caused leaf spot symptoms consisting of sunken, dark brown lesions similar to the ...

2013
Louis B

Foliar blight of potato caused by Aspergillus terreus is reported for the first time. The blight is characterized by a brown leaf apex amounting to 35‒65% of the total leaf surface. The pathogen was identified on the basis of morphological characters and ribosomal DNA sequence data. The fungus produced effuse white colonies, branched hyphae, broom-like conidiophores, and globose accessory conid...

2014
Kyung-Sook Han Seung-Kook Choi Hyeong-Hwan Kim Sung-Chan Lee Jong-Han Park Myoung-Rae Cho Mi-Jeong Park

In 2010, symptoms of leaf and stem rot were observed on potted plants (Peperomia quadrangularis) in a greenhouse in Yongin, Korea. The causative pathogen was identified as Myrothecium roridum based on morphological data, internal transcribed spacer sequence analysis, and pathogenicity test. To our knowledge, this is the first report of M. roridum causing leaf and stem rot disease on P. quadrang...

Journal: :Clinical Chemistry 2016

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